jQuery实现切换字体大小的方法

$.fn.switchSize = function(settings) {
// defaults settings
settings = $.extend({
    container: 'body',
    arrSizeClass: ['small', 'medium', 'large'],
    defaultClass: 'medium',
    saveCookie: true
}, settings);
var $container = $(settings.container);
return this
    .each(function() {
        if ($.cookie('switchSize')) {
        $container.addClass($.cookie('switchSize'));
        $(this).data("current", $.cookie('switchSize'))
        }
    })
    .bind("click", function() {
        var pos;
        if ($(this).data("current")) {
        pos = jQuery.inArray($(this).data("current"), settings.arrSizeClass);
        } else {
        pos = jQuery.inArray(settings.defaultClass, settings.arrSizeClass);
        }
        if (pos >= 0) { //Found Class
        if (pos == settings.arrSizeClass.length - 1) { //Check if last
            $(this).data("current", settings.arrSizeClass[0]);
        } else {
            $(this).data("current", settings.arrSizeClass[pos + 1]);
        }
        } else {
        //To prevent error
        $(this).data("current", settings.arrSizeClass[0]);
        }
 
        $container.removeClass(settings.arrSizeClass[pos]).addClass($(this).data("current"));
 
        if (settings.saveCookie === true) {
        $.cookie('switchSize', $(this).data("current"), { expires: 365, path: '/' });
        }
    });
};